Is it best to buy a transformer in the USA and take it to China or get one there, outlet shape?

Hi, you can buy the transformer in China for CNY100-200. Well, as the shape of a socket varies between countries, a portable plug adaptor may also be necessary. It can be purchased from travel stores (such as Franzus) or electronics stores (i.e. RadioShack, Best Buy) in your local countries. Also you can buy it in China.